399000999 has 16 divisors (see below), whose sum is σ = 576398592. Its totient is φ = 244530048.

The previous prime is 399000983. The next prime is 399001027. The reversal of 399000999 is 999000993.

It is not a de Polignac number, because 399000999 - 2⁴ = 399000983 is a prime.

399000999 is a modest number, since divided by 999 gives 399 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399000919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88779 + ... + 93164.

It is an arithmetic number, because the mean of its divisors is an integer number (36024912).

Almost surely, 2^399000999 is an apocalyptic number.

399000999 is a deficient number, since it is larger than the sum of its proper divisors (177397593).

399000999 is a wasteful number, since it uses less digits than its factorization.

399000999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182006.

The product of its (nonzero) digits is 177147, while the sum is 48.

The square root of 399000999 is about 19975.0093616999. The cubic root of 399000999 is about 736.1923965106.

The spelling of 399000999 in words is "three hundred ninety-nine million, nine hundred ninety-nine", and thus it is an aban number.